/* ==========================================================================
   TK999 Bangladesh Official Design System (2026)
   Optimized for High-Speed Mobile & Desktop, 0 CLS, E-E-A-T Compliance
   ========================================================================== */

:root {
  --bg-primary: #0a0f1d;
  --bg-secondary: #111827;
  --bg-card: #1e293b;
  --bg-card-hover: #283548;
  --text-main: #f8fafc;
  --text-muted: #94a3b8;
  --accent-gold: #f59e0b;
  --accent-gold-hover: #d97706;
  --accent-emerald: #10b981;
  --accent-emerald-hover: #059669;
  --accent-blue: #3b82f6;
  --accent-red: #ef4444;
  --border-color: #334155;
  --radius-sm: 6px;
  --radius-md: 10px;
  --radius-lg: 16px;
  --shadow: 0 4px 20px -2px rgba(0, 0, 0, 0.5);
  --font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
}

*, *::before, *::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

html {
  font-size: 16px;
  scroll-behavior: smooth;
}

body {
  background-color: var(--bg-primary);
  color: var(--text-main);
  font-family: var(--font-family);
  line-height: 1.6;
  min-height: 100vh;
  display: flex;
  flex-direction: column;
}

a {
  color: var(--accent-gold);
  text-decoration: none;
  transition: color 0.2s ease;
}

a:hover {
  color: #fcd34d;
}

img {
  max-width: 100%;
  height: auto;
  display: block;
}

.container {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 1.25rem;
  width: 100%;
}

/* Header & Navigation */
.site-header {
  background: rgba(10, 15, 29, 0.95);
  backdrop-filter: blur(10px);
  position: sticky;
  top: 0;
  z-index: 100;
  border-bottom: 1px solid var(--border-color);
}

.header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0.75rem 0;
}

.brand-logo {
  display: flex;
  align-items: center;
  gap: 0.75rem;
}

.brand-logo img {
  width: 140px;
  height: auto;
}

.brand-logo .brand-text {
  font-size: 1.5rem;
  font-weight: 800;
  letter-spacing: -0.5px;
  color: #fff;
}

.brand-logo .brand-text span {
  color: var(--accent-gold);
}

.main-nav {
  display: flex;
  align-items: center;
  gap: 1.5rem;
}

.nav-links {
  display: flex;
  align-items: center;
  gap: 1.25rem;
  list-style: none;
}

.nav-links a {
  color: #e2e8f0;
  font-weight: 600;
  font-size: 0.95rem;
  padding: 0.5rem 0;
}

.nav-links a:hover, .nav-links a.active {
  color: var(--accent-gold);
}

.header-actions {
  display: flex;
  align-items: center;
  gap: 0.75rem;
}

/* CTA Buttons */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.5rem;
  font-weight: 700;
  font-size: 0.95rem;
  padding: 0.65rem 1.25rem;
  border-radius: var(--radius-sm);
  cursor: pointer;
  border: none;
  transition: all 0.2s ease;
  text-align: center;
}

.btn-primary {
  background: linear-gradient(135deg, #f59e0b 0%, #d97706 100%);
  color: #000;
  box-shadow: 0 4px 15px rgba(245, 158, 11, 0.35);
}

.btn-primary:hover {
  background: linear-gradient(135deg, #fbbf24 0%, #b45309 100%);
  color: #000;
  transform: translateY(-1px);
}

.btn-emerald {
  background: linear-gradient(135deg, #10b981 0%, #059669 100%);
  color: #fff;
  box-shadow: 0 4px 15px rgba(16, 185, 129, 0.35);
}

.btn-emerald:hover {
  background: linear-gradient(135deg, #34d399 0%, #047857 100%);
  color: #fff;
  transform: translateY(-1px);
}

.btn-outline {
  background: transparent;
  color: #e2e8f0;
  border: 1px solid var(--border-color);
}

.btn-outline:hover {
  border-color: var(--accent-gold);
  color: var(--accent-gold);
}

.btn-sm {
  padding: 0.4rem 0.85rem;
  font-size: 0.85rem;
}

.btn-lg {
  padding: 0.85rem 1.75rem;
  font-size: 1.1rem;
}

/* Trust Bar */
.trust-bar {
  background: var(--bg-secondary);
  border-bottom: 1px solid var(--border-color);
  padding: 0.5rem 0;
  font-size: 0.85rem;
}

.trust-bar-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 1rem;
}

.trust-badges {
  display: flex;
  align-items: center;
  gap: 1rem;
}

.trust-badge-item {
  display: flex;
  align-items: center;
  gap: 0.4rem;
  color: var(--text-muted);
}

.trust-badge-item img {
  height: 22px;
  width: auto;
}

/* Breadcrumbs */
.breadcrumbs {
  padding: 1rem 0 0.5rem 0;
  font-size: 0.875rem;
  color: var(--text-muted);
}

.breadcrumbs ol {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 0.5rem;
  list-style: none;
}

.breadcrumbs li + li::before {
  content: "/";
  margin-right: 0.5rem;
  color: var(--border-color);
}

.breadcrumbs a {
  color: var(--text-muted);
}

.breadcrumbs a:hover {
  color: var(--accent-gold);
}

/* Main Content Layout */
.main-wrapper {
  flex: 1;
  padding: 1.5rem 0 3rem 0;
}

.content-grid {
  display: grid;
  grid-template-columns: 1fr 340px;
  gap: 2rem;
}

@media (max-width: 992px) {
  .content-grid {
    grid-template-columns: 1fr;
  }
  .main-nav {
    display: none;
  }
}

/* Article Styles */
.article-header {
  margin-bottom: 1.5rem;
}

.badge-tag {
  display: inline-block;
  background: rgba(245, 158, 11, 0.15);
  color: var(--accent-gold);
  border: 1px solid rgba(245, 158, 11, 0.3);
  font-size: 0.8rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.5px;
  padding: 0.25rem 0.65rem;
  border-radius: var(--radius-sm);
  margin-bottom: 0.75rem;
}

.article-title {
  font-size: 2.25rem;
  font-weight: 800;
  line-height: 1.25;
  color: #fff;
  margin-bottom: 0.75rem;
}

@media (max-width: 768px) {
  .article-title {
    font-size: 1.75rem;
  }
}

.article-meta {
  display: flex;
  align-items: center;
  flex-wrap: wrap;
  gap: 1.25rem;
  font-size: 0.875rem;
  color: var(--text-muted);
  border-bottom: 1px solid var(--border-color);
  padding-bottom: 1rem;
}

/* Answer Capsule (GEO / AEO Google Snippet Box) */
.answer-capsule {
  background: linear-gradient(135deg, rgba(30, 41, 59, 0.9) 0%, rgba(15, 23, 42, 0.9) 100%);
  border: 1px solid #3b82f6;
  border-left: 5px solid #3b82f6;
  border-radius: var(--radius-md);
  padding: 1.25rem 1.5rem;
  margin: 1.5rem 0;
  box-shadow: var(--shadow);
}

.capsule-badge {
  display: inline-flex;
  align-items: center;
  gap: 0.4rem;
  font-size: 0.8rem;
  font-weight: 700;
  color: #60a5fa;
  text-transform: uppercase;
  letter-spacing: 0.5px;
  margin-bottom: 0.5rem;
}

.capsule-text {
  font-size: 1.05rem;
  line-height: 1.6;
  color: #f1f5f9;
  font-weight: 500;
}

/* Featured Media */
.featured-media {
  margin: 1.75rem 0;
  border-radius: var(--radius-md);
  overflow: hidden;
  border: 1px solid var(--border-color);
  background: var(--bg-card);
}

.featured-media img {
  width: 100%;
  height: auto;
  object-fit: cover;
}

.featured-media figcaption {
  padding: 0.5rem 1rem;
  font-size: 0.8rem;
  color: var(--text-muted);
  text-align: center;
  background: var(--bg-secondary);
}

/* Content Typography */
.content-body h2 {
  font-size: 1.5rem;
  font-weight: 700;
  color: #fff;
  margin: 2rem 0 1rem 0;
  padding-bottom: 0.5rem;
  border-bottom: 1px solid var(--border-color);
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

.content-body h3 {
  font-size: 1.2rem;
  font-weight: 600;
  color: #f1f5f9;
  margin: 1.5rem 0 0.75rem 0;
}

.content-body p {
  margin-bottom: 1.25rem;
  color: #cbd5e1;
  font-size: 1rem;
  line-height: 1.75;
}

.content-body ul, .content-body ol {
  margin-bottom: 1.25rem;
  padding-left: 1.5rem;
  color: #cbd5e1;
}

.content-body li {
  margin-bottom: 0.5rem;
}

/* Quick Facts & Spec Tables */
.data-table-wrapper {
  overflow-x: auto;
  margin: 1.5rem 0;
  border-radius: var(--radius-md);
  border: 1px solid var(--border-color);
}

.data-table {
  width: 100%;
  border-collapse: collapse;
  text-align: left;
  font-size: 0.925rem;
  background: var(--bg-card);
}

.data-table th, .data-table td {
  padding: 0.75rem 1rem;
  border-bottom: 1px solid var(--border-color);
}

.data-table th {
  background: #0f172a;
  color: var(--accent-gold);
  font-weight: 700;
}

.data-table tr:hover td {
  background: var(--bg-card-hover);
}

/* Step-by-step Cards */
.steps-container {
  display: flex;
  flex-direction: column;
  gap: 1rem;
  margin: 1.5rem 0;
}

.step-card {
  display: flex;
  gap: 1rem;
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  padding: 1.25rem;
}

.step-num {
  background: var(--accent-gold);
  color: #000;
  font-weight: 800;
  width: 36px;
  height: 36px;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
}

.step-content h4 {
  font-size: 1.05rem;
  color: #fff;
  margin-bottom: 0.35rem;
}

.step-content p {
  margin-bottom: 0;
  font-size: 0.925rem;
}

/* CTA Promo Box */
.cta-box {
  background: linear-gradient(135deg, #1e293b 0%, #0f172a 100%);
  border: 1px solid var(--accent-gold);
  border-radius: var(--radius-lg);
  padding: 2rem;
  text-align: center;
  margin: 2.5rem 0;
  box-shadow: 0 10px 25px rgba(245, 158, 11, 0.15);
}

.cta-box h3 {
  font-size: 1.75rem;
  font-weight: 800;
  color: #fff;
  margin-bottom: 0.5rem;
}

.cta-box p {
  color: #cbd5e1;
  max-width: 600px;
  margin: 0 auto 1.5rem auto;
}

.cta-buttons {
  display: flex;
  align-items: center;
  justify-content: center;
  flex-wrap: wrap;
  gap: 1rem;
}

/* FAQ Accordion */
.faq-section {
  margin: 2.5rem 0;
}

.faq-item {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  margin-bottom: 0.75rem;
  overflow: hidden;
}

.faq-question {
  padding: 1rem 1.25rem;
  font-weight: 700;
  font-size: 1.05rem;
  color: #fff;
  cursor: pointer;
  display: flex;
  justify-content: space-between;
  align-items: center;
  user-select: none;
}

.faq-question::after {
  content: "+";
  font-size: 1.3rem;
  color: var(--accent-gold);
  font-weight: bold;
}

.faq-item.active .faq-question::after {
  content: "−";
}

.faq-answer {
  padding: 0 1.25rem 1.25rem 1.25rem;
  color: #94a3b8;
  font-size: 0.95rem;
  line-height: 1.6;
}

/* Author Box (E-E-A-T) */
.author-box {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  padding: 1.5rem;
  margin: 2.5rem 0;
  display: flex;
  gap: 1.25rem;
  align-items: center;
}

.author-img {
  width: 80px;
  height: 80px;
  border-radius: 50%;
  object-fit: cover;
  border: 2px solid var(--accent-gold);
  flex-shrink: 0;
}

.author-info h4 {
  color: #fff;
  font-size: 1.1rem;
  margin-bottom: 0.25rem;
}

.author-title {
  color: var(--accent-gold);
  font-size: 0.85rem;
  font-weight: 600;
  margin-bottom: 0.5rem;
}

.author-bio {
  color: var(--text-muted);
  font-size: 0.875rem;
  line-height: 1.5;
  margin-bottom: 0;
}

/* Sidebar Styles */
.site-sidebar {
  display: flex;
  flex-direction: column;
  gap: 1.5rem;
}

.sidebar-widget {
  background: var(--bg-secondary);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  padding: 1.25rem;
}

.widget-title {
  font-size: 1.1rem;
  font-weight: 700;
  color: #fff;
  margin-bottom: 1rem;
  padding-bottom: 0.5rem;
  border-bottom: 1px solid var(--border-color);
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

.widget-links {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 0.6rem;
}

.widget-links a {
  color: #cbd5e1;
  font-size: 0.9rem;
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0.35rem 0;
  transition: all 0.2s ease;
}

.widget-links a:hover {
  color: var(--accent-gold);
  transform: translateX(4px);
}

.widget-links a span.badge {
  font-size: 0.75rem;
  background: rgba(245, 158, 11, 0.15);
  color: var(--accent-gold);
  padding: 0.15rem 0.45rem;
  border-radius: var(--radius-sm);
}

/* Floating / Mobile Bottom Nav */
.mobile-bottom-nav {
  display: none;
  position: fixed;
  bottom: 0;
  left: 0;
  right: 0;
  background: rgba(10, 15, 29, 0.98);
  border-top: 1px solid var(--border-color);
  z-index: 999;
  padding: 0.4rem 0.5rem;
}

@media (max-width: 768px) {
  .mobile-bottom-nav {
    display: flex;
    justify-content: space-around;
    align-items: center;
  }
  body {
    padding-bottom: 60px;
  }
}

.mobile-nav-item {
  display: flex;
  flex-direction: column;
  align-items: center;
  color: #94a3b8;
  font-size: 0.75rem;
  font-weight: 600;
  gap: 0.15rem;
}

.mobile-nav-item.active, .mobile-nav-item:hover {
  color: var(--accent-gold);
}

/* Footer Styles */
.site-footer {
  background: #060913;
  border-top: 1px solid var(--border-color);
  padding: 3rem 0 1.5rem 0;
  margin-top: auto;
  font-size: 0.875rem;
  color: var(--text-muted);
}

.footer-grid {
  display: grid;
  grid-template-columns: 2fr 1fr 1fr 1fr 1fr;
  gap: 2rem;
  margin-bottom: 2.5rem;
}

@media (max-width: 992px) {
  .footer-grid {
    grid-template-columns: 1fr 1fr;
  }
}

@media (max-width: 576px) {
  .footer-grid {
    grid-template-columns: 1fr;
  }
}

.footer-brand p {
  margin: 1rem 0;
  line-height: 1.6;
}

.footer-col h4 {
  color: #fff;
  font-size: 1rem;
  font-weight: 700;
  margin-bottom: 1rem;
}

.footer-col ul {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
}

.footer-col a {
  color: var(--text-muted);
}

.footer-col a:hover {
  color: var(--accent-gold);
}

.footer-compliance {
  border-top: 1px solid var(--border-color);
  padding-top: 1.5rem;
  margin-top: 1.5rem;
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 1rem;
  font-size: 0.8rem;
}

.compliance-seals {
  display: flex;
  align-items: center;
  gap: 1.25rem;
}

.compliance-seals img {
  height: 28px;
  width: auto;
  opacity: 0.85;
}

.footer-bottom {
  text-align: center;
  margin-top: 1.5rem;
  font-size: 0.8rem;
  color: #64748b;
}